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Icon resource id will be set from native feature code.
ResourceMapper::MapToJavaDrawableId() will be used for mapping from
native constant to Android resource id.

This CL adds logic to porpagate the icon resource id to
MessageBannerView.

BUG=1123947
R=twellington@chromium.org

Change-Id: I6c57d9ddd180f229bedffdae3c677fd2c8efc32f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2523472
Commit-Queue: Pavel Yatsuk <pavely@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825065}